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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 93 for “"Colloidal Stability"”.
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Controlling Colloidal Stability using Highly Charged Nanoparticles
… components of the project centered on a model colloidal system containing silica microparticles at the isoelectric point where the suspensions are unstable and prone to flocculation. The stability of the silica suspensions was studied in the presence of highly charged nanoparticles. Initial …
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Colloidal stability of magnetic nanoparticles in molten salts
… of the medium make it difficult to make a colloidally stable dispersion of nanoparticles in molten salts. The aggregation and sedimentation kinetics of different nanoparticles dispersed in molten salts is studied, and trends of settling rates with system parameters like particle size, …
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Handling Characteristics and Colloidal Stability of an Orthodontic Sealant Containing Microcapsules
… the study of handling characteristics and colloidal stability of the formulations. Orthodontists require consistent and predictable handling which is reflected by colloidal stability. Multiple formulations were developed with varying ratios in the continuous phase, glass loading, and fumed …
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Colloidal Stability, Rheology, and Flexural Strength of Antiviral 3D Printable Colloids
… 5 different antiviral fillers (5 and 10 w/w%) on colloidal stability, viscosity, and flexural strength. Methods: Colloids consisting of five different antiviral fillers [BIOSAFE Glass and 4 different ion-releasing zeolites (Ag only, Cu only, Ag/Cu, and Ag/Zn)] were formulated with varied amounts …
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Implications of Oxidation on the Colloidal Stability of Magnetite Nanoparticles and Cluster
… magnetite clusters and a potential increase in stability are expected after oxidation. To support these findings, an extended series of experiments to measure the aggregation and the sedimentation of clusters of unoxidized and oxidized magnetite nanoparticles were conducted. Although the …
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The Effect Of Colloidal Stability On The Heat Transfer Characteristics Of Nanosilica Dispersed Fluids
… of nanofluids. In this work, the stability of nano particles was studied by measuring the zeta potential of colloidal particles, particle concentration and size. Two different sizes of silica nano particles, 10 nm and 20 nm are used in this investigation at 0.2 vol. % and 0.5 vol. …
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Evaluation of Colloidal Stability and Ecotoxicity of Metal-based Nanoparticles in the Aquatic and Terrestrial Systems
… (cysteine, humic acid, and trolox) modulate colloidal stability, ion release, and aquatic toxicity of silver nanoparticles (AgNP); and (iii) the developmental responses of crop plants exposed to Ag- or ZnO- (zinc oxide) nanoparticles.</p> <p>Results suggest that the MetPLATEcan be considered …
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Formation of uniform particles: Morphology and colloidal stability, and stable particle growth during precipitation from titanium alkoxides
… of shear and the mechanisms of growth of colloidally stable suspensions are discussed. Two factors are identified which control colloidal stability and precipitate morphology during precipitation: interaction potentials of the precipitates and the nature of depositing species. A short …
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The role of soil clays and clay-humic complexes in processes controlling colloidal stability and the sorption and degradation of tetracyclines
… used to explain dispersion and flocculation in colloidal systems, however little is known about the effect of crystalline swelling on colloidal behavior. The first topic addressed in the dissertation is the effect of monovalent and divalent cations on crystalline swelling and the breakup and …
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In-Depth Study of Different Magnetorheological Fluid Properties Under Different Operating Parameters, and in Presence of Organic Additives
… without performance degradation, ensuring MRF colloidal stability and reusability. The work presented here will focus on developing an in-depth understanding of MRF rheology as a function of varying MRF formulation, and various operating parameters simultaneously. The results demonstrated a …
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Zirconium-based metal-organic frameworks as drug delivery systems
… were observed, which could interfere MOFs’ colloidal stability for drug delivery applications. In order to improve MOFs' colloidal stability, a panel of Zr-based MOFs were surface functionalised with methoxy polyethylene glycol (mPEG-PO3) followed by lyophilisation. These PEGylated nanoMOFs …
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Rheological Investigations of Latex-Surfactant-Associative Thickener Aqueous Systems
… fully-formulated waterborne coatings to provide colloidal stability, thickening, and other functionality. The behavior of each ingredient in a coating must be understood and controlled to maintain colloidal stability as well as balance other desired properties of the liquid coating and the dry …
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Biopolymer-Hybrid Nanomaterials for Vaccine Formulation
… the technique was significantly constrained by stability issues of the administered genes and low transfection efficacies. To stabilise the fragile genes, prevent their premature degradation and systemic clearance upon administration, a variety of carrier materials, including liposomes, …
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Polymer- and Bioadditives-Assisted Synthesis and Surface Modification of Anisotropic Gold Nanocrystals
… during growth, which enhance the long-term shape stability and colloidal stability after functionalization. Chapter 1 is a literature review of the various methods for producing anisotropic nanoparticles followed by a description of the current growth mechanisms, applications and surface …
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Solution and Adsorption Characterization of Novel Water-Soluble Ionic Block Copolymers for Stabilization of Magnetite Nanoparticles
… or as MRI contrast agents where composition and stability are essential for the complexes to function. This work outlines a general methodology for rationally designing complexes stabilized with polymer brush layers using adapted star polymer models for brush extension and pair potential. Block …
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Implications of Shape Factors on Fate, Uptake, and Nanotoxicity of Gold Nanomaterials
… contaminants post-use due to their high colloidal stability in the aquatic systems. Despite, the environmental risks associated with these nanoparticles, just a few studies have investigated the effect of nanofeature factors such as size and shape on the overall fate/transport and …
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Fluorinated Nanoparticles: A Novel Technology Platform for Multimodal Biomedical Imaging Applications
… hydrophilic crosslinker to enhance the aqueous colloidal stability of the nanoparticles. Nanoparticles were then characterized to determine their chemical properties, colloidal stability, and suitability for use as a 19F MRI and SIMS contrast agent. Particle sizes were measured using small angle …
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Aerosolizable Drug-Loaded SPIONs for Treatment and Diagnosis of Pulmonary Tuberculosis
… and surface-stabilized with oleic acid to ensure colloidal stability. These SPIONs were subsequently encapsulated within PLGA-PEG matrices using an emulsion solvent evaporation method, with Ethambutol and a novel MmpL3 inhibitor, N-(adamantyl)-1H-indole-2-carboxamide (N2), incorporated as model …
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Continuous synthesis of metallic and oxidic palladium nanoparticles with tunable sizes for catalytic applications
… range between ~2.5-5 nm, which maintain their colloidal stability even in the absence of in-situ stabilisers. Palladium oxide is synthesised via the hydrolysis of a metal precursor using base, whereas palladium is synthesised via the reduction of various metal precursors using sodium …
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